Researchers found that average winter wave heights have grown by as much as a foot since 1970, when global warming is believed to have begun accelerating.
Bromirski was also surprised to find extended periods of exceptionally low wave heights prior to about 1970 and none of those periods since.
The study, published Tuesday in the Journal of Geophysical Research: Oceans, adds to the evidence that climate change is causing massive shifts in the world’s oceans. Other studies have shown waves are not only getting taller but also more powerful. Bromirski said that is a harbinger of the future. Scientists say global warming may even be accelerating, ushering in even bigger waves.
These issues are of particular concern along the California coast, where sea cliffs have already started crumbling and brought down homes in recent years. Because of sea level rise, projections at the end of the 21st century indicate even moderate waves might cause damage comparable to that of extreme weather events, according to the study.
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